Door operating mechanism for horizontal coking chamber ovens



Feb. 5,1957 v e. HENSELEIT 2,730,366

DOOR OPERATINGMECHANISM FOR HORIZONTAL CQKING CHAMBEROVENS Filed May 26, 1955 v V 2 Sheets-Sheet 1 JIWEIYTOR.

mronmzx Feb. 5, 1957 e. HENSELEIT 2,730,366

DOOR QPERATING MECHANISM FOR HORIZQNTAL COKING CHAMBER OVENS Filed ma 26, 1955 v YZ SheetS-Sheet 2 TEL g JNVENTOR.

United States Patent DOOR OPERATING MECHANISM FOR HORI- ZONTAL COKIN G CHAMBER OVENS Georg Henseleit, Essen, Germany, assignor, by mesne assignments, to Koppers Company, Inc., Pittsburgh, Pa., a corporation of Delaware 7 Application May 26, 1953, Serial No. 357,488

2 Claims. 01. 212-4 Our copending application Serial No. 303,116, filed August 7, 1952, is concerned with a door operating mechanism for horizontal coking chamber ovens by which an oven door, after being unlatched, is lifted, withdrawn, and moved or pivoted aside, this mechanism incorporating fluid pressure means such as a pneumatic or hydraulic pressure means for releasing the closure latches of the door and another such means, independent of the first, for lifting or clearing the door from its door frame mounting seat.

It is an object of the present invention to so devise the pneumatic or hydraulic fluid pressure means for lifting or clearing the door, that this latter action can be performed also directly by hand, or by an electric motor, should the pneumatic or hydraulic apparatus fail.

A further object of the invention is so to provide the mechanism that when differences in height develop between the oven battery and the track on which the operating machinery runs (a phenomenon frequently encountered as a result of the sinking of the ground) the position of lever or levers engaging the door for the purpose of clearing it from its mounting or seat can always be compensated during the actual performance of the clearance by simple rotation by means of a hand crank, without thereby otherwise affecting the effective door-lifting stroke.

In the present invention a thrust device is used to transmit a thrust from an operating motor of the fluid pressure operated type to the door-lifting means, which thrust device is also alternatively operable manually or by an electric motor through a toothed drive, e. g. a worm and worm wheel drive.

Advantageously the thrust transmission device comprises a thrust rod and a sleeve or cylinder with which this rod has a screw-threaded connection, this sleeve or cylinder being rotatable by said toothed drive to produce an increase or shortening of the effecting length of the transmission device.

Preferably the thrust rod is adapted to actuate doorlifting claws through articulated connections, and the sleeve or cylinder is connected to the shaft of the operating motor through a coupling which allows relative rotational movement, but not relative axial movement, between these parts.

Moreover the sleeve or cylinder is advantageously splined or keyed for relative longitudinal sliding in a worm wheel forming part of said toothed drive.

A preferred embodiment of the invention is illustrated by way of example in the accompanying drawings in which:

Figure 1 is a vertical section through the end of an oven chamber with a door mounted therein, and showing a form of door operating mechanism engaging this door.

Figure 2 is a longitudinal section through the operative parts of a thrust device for clearing the door from its mounting or door seat and shows the thrust rod 2,780,366 Patented Feb. 5, 1957 2 which is capable of connection to a pneumatic fluid pressure operated device, and

Figure 3 is a section through the left hand half, and Figure 3 is a section through the right hand half of the same assembly as in Figure 2, but illustrating the thrust rod in different positions.

As can be seen from Figure 1, the door 2 is in the position in which it closes the oven chamber 1, sealing ribs 3 on the door are pressed against a fixed sealing surface of the door frame 4 by closure springs 5 arranged in appropriate housings. This spring pressure is transmitted to the door 2 through top and bottom closure latches 6, the arms (not shown) of which engage behind hooks arranged on-the oven body.

The door operating mechanism 11 which may be 1 connected with the coke guide means on the coke side of the battery, and with the pusher machine on the opposite side of the battery, is arranged to move in the axial direction of the oven chambers by means of upper wheels 11 and lower shoes 11 on a trackway 7' on a carriage frame 7, to enable it to be moved directly against a door for the purpose of raising the door 2. Moreover,

at the door side of these pivot bearings 12, the arms of the two levers 13 and 14 are interconnected by a link 16, in consequence of which either one of these levers can be operated to cause a common movement of both f levers. Such operation is effected in fact by a link 17 which is articulated to the end of the arm of the upper lever 13 that is remote from the door with the pivot 12 in between.

The link 17 consists of a pair of plates which in turn are articulated at 25 to the upper-end of a thrust rod 18 which is connected, through gearing to be later described in a casing 19, with a pneumatic bellows motor which is generally designated by the numeral 20 in Figure 1.

Referring now to Figure 2, the outer end of the push rod 21 of the fluid pressure operated motor 20 is coupled through a sleeve or bush 23 with an extension 22 on a sleeve 22 surrounding the lower end of the thrust rod 13, such that this sleeve 22 can rotate independently relative to the push rod 21. The sleeve 22 is of cylindrical form at its upper end and is furnished with internal threading mating with external screw threading on the lower end of the rod 18. This latter is formed with an eye for pivot 25 enabling it to be connected, as described above, to the plates of link 17 and thus to the lever 13.

The sleeve 22 is provided externally with splines 24 on which a worm wheel 26 is mounted so that, when the push rod 21 is displaced by the motor 20, the sleeve 22 is movable longitudinally in, and axially of, this worm wheel 26, from the position shown for the left half as in Figure 3 to the elevated position shown for the right half as in Figure 3 The worm wheel 26 is adapted to be rotated by means of a worm 27 which is turned by a hand wheel 28 through a chain 29 (see Figure 1) and, by virtue of the arrangement described above, the sleeve 22 is thereby rotated relatively to rod 18, this producing a lengthening or contraction of the thrust assembly 18, 22, as the case may be depending on the direction of turning of hand wheel 28. The rod 18 is illustrated in Fig. 3 with its left half in its bottom position as shown in Fig. 2, i. e.,

in the position in which the claws 13 and 14 are elevated, by depression of rod 18, to engage the door lugs 15. The uppermost position of the rod 18 for release of the claws of levers 13, 14, from the lugs 15, produced by the aforesaid rotation of the worm 27, is indicated by the dotted lines in Fig. 2.

The worm and worm wheel gear 26 and 27 is enclosed in the upper wider casing part 29 of casing 19, the lower part 30 of which casing 19 closely surrounds the wall of the sleeve 22. The worm wheel 26 is mounted from below on ball bearings 31 and, at its upper side is applied against the casing 19 through a bearing ring 32. The thrust rod 18 is guided in a bearing bushing 33 arranged in a housing formed by an adjustable nut 34, a ball race 35 being disposed between the nut 34 and the upper end of the sleeve 22.

The left-hand half as in Figure 3 illustrates the positions assumed by the sleeve 22 and the rod 18 when the motor 20 is under compression, i. e. when the device is operated to unseat the door, at which time the claws o1 levers 13 and 14 are engaged with the door lugs 15 and have cleared the door from its door frame 4 to enable it to be lifted away. The thrust assembly 18, 22 has consequently been brought down to its lower position, and in this particular end condition a ring 37 which is connected to the nut 34 is applied against the upper end of a cylindrical boss 38 of the casing 19. When the claws of levers 13 and 14 are to be disengaged from the lugs 15 the thrust rod 18 is moved upwards as illustrated in the right hand part as in Figure 3 by the upward movement of the piston in the motor 20. This moves rod 21 upwardly. which elevates the casing extension 22' and the casing 22. The upper end of casing 22 thereupon raises the ball race 35, in which case the nut 34 is raised from the cylindrical boss 38 of the casing 19 along a splined guideway 39 in the boss 38. As is apparent from the foregoing, the thrust movement is effected by the motor 20 without adjustment of the rod 18 in the sleeve 22 and simply by an axial movement of both together in unison. Should, however, this fluid pressure operated motor become inoperative, the claw levers 13, can be actuated manually through the rod 18 by the rotary movement of sleeve 22 produced by the worm wheel 26. In this case the sleeve 22, 22 rotates with relation to the push rod 21 but without altering their axial spaced relation. Such manual adjustment of the rod 18 as by chain drive 29, Fig. 1, moreover, enables the rod 18 to be moved axially out of, or into, the sleeve 22. Such mechanism is used to compensate for differences in level between the oven chamber lugs or hooks 15 and the track 9 which supports the door operating mechanism 11, to ensure the required engagement between the lifting claws of levers 13, 14, and the door lugs 15. This adjustment does not affect the eifective length of the stroke of the claws of levers 13, 14, i. e. amount of clearance of the door from its seat, when operated by motor 20, since this stroke is determined by the length of the stroke of the piston in the motor 20. Consequently this adjustment can be effected without difiiculty during the actual operation of the machine 11'.

What I claim is:

1. Door operating mechanism for horizontal coking chamber ovens, comprising: a door carrier having door lifting means by which an oven door, after being unlatched, may be lifted, withdrawn, and moved aside, said door carrier including a fluid pressure operated piston motor, a thrust rod connected to the door lifting means, an outer sleeve around a portion of said thrust rod with a screw threaded connection therebetween, a worm gear around said sleeve with a splined connection therebetween for axial movement of the sleeve relative to the gear and rotary movement of the sleeve on said screw threads upon rotation of said worm gear, a worm pinion for said worm gear, mechanical actuating means for rotation of said pinion, and a piston rod for said piston, said piston rod being connected with said sleeve to move the same on operation of the motor piston, said piston rod being connected with said sleeve for non-axial movement of the piston rod relative to the sleeve.

2. Apparatus as claimed in claim 1, and in which the worm gear, pinion. the splined connection portion of the gear, and the threaded portion of the thrust rod are encased in a closed casing, and in which the thrust rod projects out of the casing through an annular bushing portion of the casing, an end nut with an annular channel in axial sliding relation with said bushing, said nut closing the space between the bushing and said thrust rod and being elevated by the sleeve on axial movement of the sleeve and rod relative to the casing, on operation of the piston rod to operate the lifting device, in one direction of movement of the piston of said motor, said nut being spline connected to said bushing for guiding it in its axial movement along the bushing.

McIntire Jan. 28, 1919 Boyer May 30, 1922 

